[tex-eplain] fix the URL in README

[Dorai Sitaram]

Done.  This is now in eplain-2.8.3.


> 
>     -WWW:    http://www.cs.rice.edu/~dorai/eplain
>     +WWW:    http://www.ccs.neu.edu/~dorai/eplain
> 
> I'd actually like to suggest that http://tug.org/eplain be advertised.
> That should always work (at least as long as I'm involved with TUG and
> Eplain :).
> 
> Ok, Dorai?
> 
> (Thanks Stepan.)
> 
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